There are three classes of ACME threads giving varying degrees of free movement. The table below gives the dimensions for tolerance class 2G. Tighter tolerances are defined in classes 3G and 4G

 

Actions ID Designation Size Tpi Tol Class Major Dia Max Major Dia Min Pitch Dia Max Pitch Dia Min Minor Dia Max Minor Dia Min
1 3/8-12 Acme 0.375 12 2G 0.375 0.385 0.346 0.333 0.297 0.292
2 1/2-10 Acme 0.500 10 2G 0.540 0.520 0.464 0.450 0.405 0.400
3 5/8- 4 Acme 0.625 4 2G STUB 0.665 0.645 0.570 0.550 0.488 0.475
4 5/8-6 Acme 0.625 6 2G 0.665 0.645 0.559 0.542 0.467 0.458
5 5/8-8 Acme 0.625 8 2G 0.665 0.645 0.578 0.563 0.506 0.500
6 3/4-5 Acme 0.750 5 2G 0.790 0.770 0.669 0.650 0.560 0.550
7 3/4-6 Acme 0.750 6 2G 0.790 0.770 0.684 0.667 0.572 0.583
8 3/4-8 Acme 0.750 8 2G 0.790 0.770 0.703 0.688 0.631 0.625
9 3/4-10 Acme 0.750 10 2G 0.790 0.770 0.715 0.700 0.655 0.650
10 7/8-5 Acme 0.875 5 2G 0.915 0.895 0.794 0.775 0.685 0.675
11 7/8-6 Acme 0.875 6 2G 0.915 0.895 0.810 0.792 0.717 0.708
12 7/8-8 Acme 0.875 8 2G 0.915 0.895 0.829 0.813 0.756 0.750
13 1-4 Acme 0.875 4 2G 1.040 1.020 0.896 0.875 0.763 0.750
14 1-5 Acme 1.000 5 2G 1.040 1.020 0.919 0.900 0.810 0.800
15 1-6 Acme 1.000 6 2G 1.040 1.020 0.935 0.917 0.842 0.833
16 1-8 Acme 1.000 8 2G 1.040 1.020 0.954 0.938 0.881 0.875
17 1-10 Acme 1.000 10 2G 1.040 1.020 0.966 0.950 0.905 0.900
18 1 1/8-4 Acme 1.125 4 2G 1.165 1.145 1.021 1.000 0.888 0.875
19 1 1/8-5 Acme 1.125 5 2G 1.165 1.145 1.049 1.025 0.935 0.925
20 1 1/8-6 Acme 1.125 6 2G 1.165 1.145 1.060 1.042 0.097 0.958
21 1 1/4-4 Acme 1.250 4 2G 1.290 1.270 1.147 1.125 1.013 1.000
22 1 1/4-5 Acme 1.250 5 2G 1.290 1.270 1.170 1.150 1.060 1.050
23 1 1/4-6 Acme 1.250 6 2G 1.290 1.270 1.186 1.167 1.092 1.083
24 1 3/8-4 Acme 1.375 4 2G 1.415 1.395 1.272 1.250 1.375 1.125
25 1 3/8-5 Acme 1.375 5 2G 1.415 1.395 1.296 1.275 1.185 1.175
26 1 3/8-6 Acme 1.375 6 2G 1.415 1.395 1.311 1.292 1.217 1.208
27 1 1/2-4 Acme 1.500 4 2G 1.540 1.520 1.397 1.375 1.263 1.250
28 1 1/2-5 Acme 1.500 5 2G 1.540 1.520 1.421 1.400 1.310 1.300
29 1 1/2-6Acme 1.500 6 2G 1.540 1.520 1.436 1.417 1.342 1.333
30 1 3/4-4 Acme 1.750 4 2G 1.790 1.770 1.648 1.625 1.513 1.500